Drawing instrument



June 24 1924. 1,498,870

H. M. FOX

DRAWING INSTRUMENT Filed April 14, 1923 IN VE'N TOK Patented June 24, 1924.

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PATENT oFFIcE.

DRAWING INSTRUMENT.

Application filed April 14, 1923. Serial No. 632,035.

To all whom it may concern.

- Be it known that I, HENRY Fox, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in a Drawing Instrument, of which the following is a specification.

My invention relates to new and useful improvements in a drawin instrument, and has for its object to provide an exceedingly simple and effective device of this character which may be made of such size as tobe readily carried in the pocket of the users clothing and it may be used for produclng straight lines, angular lines, circles of different sizes, drawing lines atright angles to another, measuring distances and measurlng or laying out angles or degrees on a circle.

Another object of the invention is to form such a device from a sheet of suitable material thereby producing a body having two parallel straight edges, a straight edge at one end and at right angles to the parallel side edges and an arcuate edge at the other end concentric with a hole in the body from which radiate lines to form a protractor.

A further object of the invention is to provide a plurality of holes adjacent the end straight edge and equi-distant therefrom, said holes having a line bisectingthem and parallel to the end straight edge to form a right angle with the parallel side edges whereby said holes and the line bisecting sathem may be superimposed upon a delineated line for aroducing another line at right angles to sai delineated line by the use of one of the side ed es without the likelihood of the marking device slipping around a corner of the drawing instrument which would form. a deflecting mark. A still further object of the invention is to provide a plurality of other holes adjacent one of the. side edges and forming linesbisecting each one of said holes and one of the I holes on the base linewhich is parallel to the end straight edge whereby different angles may be produced with respect to the base:

line. V so 'VVith-these ends in view, thisinvention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

Inorder that those skilled in the art to which this invention appertains, may understand how to make and use the same, I will describe its construction in detail, referring by numerals to the accompanying drawing forming a part of this application, in which i Fig. 1, is a face view of a drawing instrument embodying my invention.

Fig. 2, is a sectional edge view thereof.

ln carrying out my invention as here embodied, 2 represents the body of the drawing instrument which may be formed from a sheet of suitable material such as, for instance, celluloid ,which is preferable because'of its transparency. This body preferably is relatively longand narrow so as to provide two parallel side straight edges 3 and 4, an endor base straight edge 5 at right angles to said side straight edges and an arcuate edge 6 at the end opposite the base straight edge.

Associated with one of the side straight edges, as 3,is an English measure or rule 7 which is delineated upon one face of the body as by printing or slightly grooving the body while associated with the other side straight edge 4 is a scale or metric measure 8 produced iirthe same manner as thelmeasure or rule 7. In the body concentric with thearcuate edge 6 is a hole 9 from which radiate lines 10 of different degrees and by placing the hole-9 over a' point said lines may be used as a protractor for measuring angles 7 and by rotating the-instrument about the point with which the hole 9 coincides until one of'the lines 10 coincides with a delineated line on a surface marks may be produced around the arcuate edge 6 in alignment with any of the protractor lines 10 after which an angular line may be produced.

- Adjacent the base or end straightedge are formed at least two holes 11 and 12 equi v distant from the base or end straight edge 5 and these holes are bisectedbya baseline 13 Y 245 which is within the base line 13.

lines 19 to 23 inclusive form angles15,.30-,.

45, and. 7 5 degrees respectively.

To produce anyone of these angles the drawing instrument is laid upon a suitable surface by bisecting a: suitable marking de vice, such as'a pencil through the-holes; 1'1 and 12 and in. lines l i-to '18 inclusive lines-of the desired angularity may be reprocl uced by: afterwards joining the'dotsmadeby the marking device by the use" of one of tlie' straight edges ofthe drawing instrument when the latter isplaced adjacent the: dots thusgiving; the lines desiredin the same manner as is generally accomplished by the use of a triangle. lVhen it is desiredto produce a line-at right angles to a delineated line the holes 11* and 12- are' caused to co" incide witlrsaid delineated lines and then by using. one of the side straight edges another line may be produced which may be caused-to joint-he delineated line without the necessity of running:themarking device to the end or corner of the drawing" instrumentso that a neat accurate line is produced without the likelihood of havingia ragged 0r deflecting} portion at the junction pointwith the said delineated line as often happens" when the edge of an instrument is caused'to coincide with the delineated line for the production of another as it oftenhappens that the marking device; will slip around the corner of the drawinginstrument.

On the longitudinalcenter of the body 2 are formed a plurality of spaced holes 2% one of which may be'used as a center for the insertion of an anchoring device,,su'cli as a pin, and the others then used for the inser- U011 of a marking device and by moving said marking device the drawing instru Inent will cause said marking device to producea circle or portion of acircle of the'desired radius' and for the centering hole I prefer to use that one of the series of holes All of the holes so far referred to are preferably of tapered formation as plainly shown in Fig' 2- inorder that pointed devices, such aspencils, may readily fit therein; I have found that it is sometimes difficult to pro duce a circle with those lines which are clos est to the" centering hole and I have thereforeprovided the three apertures25 of vary ing sizes by which circles may be produced equal to those that could be produced by the use of three holes of the set 24 closest to a centering hole.

From the foregoing description it will be seen that this drawing instrument although relatively small and compact may be used for the production of many geometrical figures as wellas for measuring distances and-degrees;- Such a device is particularly useful for a draftsman who is compelled to travel from place to place in making sketch drawings fortheprodiiction of final drawing-s; ins the drafting room.

This instrument is also exceedingly useful tostudents iii-making reproductions of lesson drawings in a note book eliminating the necessity of carrying or using separate tr'i-- angles, rulesor scales, a protractor, compass'and' the like.

Of course I do not wishto be limited to 1. A drawing instrument comprising a relatively long; and narrow strip of sheet 111atF12tl haV1DgitWO parallel straight edges,

a base edge at oneend lying at right anglesto the'edges and an arcuate edge at the opposits end,said straight-edges having scales associated therewith, said body having: at least'twoholes forme'd therein adjacent the base edge equi-distant fromsaid edge and bisected by: a base line, said body further having a hole thereinliomocentric wit-hthe' arcuatee'dgeand bisected by lines radiating therefrom to the said arcuate edge.

2; A- drawing" instrument comprising arelatively long andn'arrow stripof sheet material having two parallel= straight" edges, a base edge one end lying at right angles to the edges and ana-rcuat'eedge at the opposite end, said straight edges having scales associated therewith, said-- body having atleasttwo holes formed therein adjacent the base: equidistant from said" edge and bisected by a base line, said body also having holes formed therein in spaced relation toonc oft'heholesbisected by' the base line with a'line'bisecting each ofisaid last named holes and the other hole which is=bisected by thebase ling Said body fur=- ther having'a hole formed therein homocent'ric to the arcuate edge with radiating lines bisecting said hole and running tothe arouate edge;

3. A- drawing instrument comprising arelatively long and narrow strip of sheet material having two parallel straight edges, a base edge at one end lying zit-right angles to" the edges and an ar'cu'ate' edge" at the op posits end-, said straight edgeshaving scales associated therewith, said body having at least two holes formed therein adjacent the base equi-distant from said edge and biate edge with radiating lines bisecting said sected by a base line, said body also having hole and running to the arcuate edge, said 10 holes formed therein in spaced relation to body also having a series of spaced holes one of the holes bisected by the base line formed in the longitudinal center and an- 5 with a line bisecting each of said last named other set of three holes of varying sizes.

holes and the other hole which is bisected at In testimony whereof, I have hereunto afthe base line, said body further having a fixed my signature. hole formed therein homocentrie to the arcu- HENRY M. FOX. 

